John liked the idea of revenge against his mean older sister, "hehe, let's see how she likes being the "runt"" he exits the machines room to find Sarah having a conversation on the phone. "Sarah! Can you help me with something?" he said loud enough so that his mother could hear, noticing this she scowls at him but say's calmly into the phone, "be right back, Jen...ugh what do you want?" she added the last part as a whisper and John pointed towards the machine's room. Sarah rolled her eyes and walked quickly into the room to get it over and done with, "huh, a stupid old machine, exciting, can I go now dweeb I have more important things to do" John pointed to one of the machines pods and said "can we try it, please!"
He pouted which had no affect on her as she pulled out her phone and began to walk away, "do it or I'll tell mom you and your boyfriend had se-" his mouth was soon covered by Sarah's dainty hand. "Fine you snitch! *sigh* What does it do anyway?" she asked as she stepped into one of the pods while John stepped into the other, "you'll see!" he said excitedly as the machine began to boot up and the pods doors closed trapping them in until the process was done. John felt suddenly very tired and weak and soon collapsed upon the pods walls and fell asleep, little did he know that Sarah was experiencing the same thing and thus as both of them fell unconscious their body's began to swap.
After a few minutes the machine began to die down and the pod doors began to open John was the first to step out and immediately noticed the differences: he was taller, had longer blonder hair that covered his chest, his chest now had two boobies that pressed against the fabric of a bra and her white shirt, his new tight blue jeans and panties now felt constricting but in a good way. John loved it and smiled all the while as he squeezed his new boobies. Sarah on the other hand was less giddy, "what the hell!" she said in John's squeaky voice, nothing like her previously smooth mature teenage voice. That now belonged to John who turned towards his new baby brother and grinned, "this is what you get for treating me and Sam like shit! OooOo, a new word!" he said delighted by his new vocabulary.
"Why you little..." she charged at him with her new stubby legs only to find that she was now very weak and her punch (while not grand before) was no longer effective in the slightest as she banged her childlike hand up against her old thighs. "John, what are you doing to your sister?" their mother had just walked into the room having heard the commotion, "mom! John swapped bodies with me and now he's in my body while I'm in here, you gotta help me" Sarah pleaded. Their mother smiled and winked at John who grinned back "Oh well "Sarah" I guess I'll have to help you now..." Sarah smirked at John thinking she had won, this came crashing down as she was easily scooped up by their mother and carried off to bed while she said "by giving you a nap to calm down, my little baby boy" all the while Sarah kicked an pleaded with her mother until she was locked in her new room.
John was now sitting in the living room enjoying his sister's just deserts when suddenly a slight vibration was felt on his new bubbly ass. At first it felt nice so he sat there enjoying it, but soon he realized that it was Sarah's phone he took it out of her back pocket and found that it was Sarah's best friend Jennifer calling back. He answered and said into the phone, "Hey, Jen" Jennifer soon said back "hey, girl, so when are you going to answer me about it!" she said excitedly. Confused John said, "uhh answer about what?" he heard a scoff and then Jen said "you know about the sex session you had with Daniel! He said he was going back to your house tonight for seconds and I gotta know you answer, girlfriend!!"
John thought about it, what better way to get back at his sister for all the torment she had caused him then to fuck her own boyfriend! Then again maybe this was going on far too long as it was, what should he do?